pub(crate) fn call_contract(
    store: &mut dyn Storage,
    router: &Router,
    chain_name: ChainName,
    sender: Addr,
    destination_chain: ChainName,
    destination_address: Address,
    payload: HexBinary,
) -> Result<Response, Error> {
    // ..snip
    let msg = Message {
        cc_id: cc_id.clone(),
source_address: Address::try_from(sender.clone().into_string())
    .expect("failed to convert sender address"),
    // ..snip
    }
    ..
}
source_address: Address::try_from(sender.clone().into_string())
    .map_err(|e| Error::AddressConversionFailed(e.to_string()))?,
#[derive(Debug, thiserror::Error)]
pub enum Error {
    // ... other error variants ...
    #[error("Failed to convert sender address: {0}")]
    AddressConversionFailed(String),
}
pub(crate) fn call_contract(
    // ... other parameters ...
) -> Result<Response, Error> {
    // ... existing code ...
}
if !is_valid_address_format(&sender) {
    return Err(Error::InvalidAddressFormat(sender.to_string()));
}
